Joseph hubbell



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IMPROVEMENTINHEAD-BLocKs Fon SAW-MILLS.

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TO ALL WHOM IT MAY CONCERN;

'Be 'it known that I, JOSEPH HUBVBELL, of Zanesville, Muskingum county, 0ho,have invented a. new and useful Improvement in Saw-Mills; and I do hereby declare that therfollowingiis a full, clear, and exact descrip.- tion thereof, which will enable others `skilled. in the art to make and use the same, reference being had to-,the accompanying drawings, forming part of this specification, in which;

Figure l is a top view of the carriage with my improvements attached.

Figure 2,- a side view.'

. Fig-ure 3,.a section through one of the head-blocks, taken in the line :v x, fig. 1; and

Figure 4, a detail end view of the pushing-berend rack-pawl. i

Similar letters of reference indicate corresponding parts.n p Y This invention relates to newl and useful improvements in saw-mills, and consists in devices and arrangef ments for operating the head-blocks andA setting Vthe logs feria saw with perfect'aecuracy to cut boards 'off uniform thickness,.,as hereinafter described'.

A represents the carriageofan ordinary saw-mill, and B B the head-blocks.l On the outside of the-car-v ringe is the horizontal iron settin'gfbar a, onnected by pin-joint to the link b, which is also connected by pinjoint to th-e hand-lever'C, working in the segmental guide D, which is provided with a. series of holes forV receiving pins to regulate the movement of the lever() the operation of the-setting-bar, according-tothe thickness of the'plunk Lesbe swed. The setting-bar a passes through slotted guides ce e, fastened to the carriage to bemoved beckand forth in the guidesby the hand-lever C.' Plates cZ d ere-made fast in the bar. a. at the ends of thehead-bloclis, in which plates are inclined or diagonal slots e e for actuating the pushing-bars g g, to'move the racks L and the jacks kk Awith them. This movement ofvthcpushing-bars' is effected by means of friction-rollers z' i on pins in the ends of the bars, which rollers n'orl: the slots e e. The friction-bar -g for each head-block ,is connected hy pin-joint with an elbow-lever pawl, m, that has its p ivot or fulcrum in a yoke or co.llar,`1z, that ts, around the rack z, as seen in detail, fig. 4. The rack z has teeth,'in which the pawl m engages to move, it lforward for setting the log to the saw, which-operation, it will be seen, is effected by drawing the hand-lever C forward to `slide the setting-bar a, when the friction-roller z' movesin the slot e in the stationary plate d, and thus 4pushesi'nfthe bar g to engage the pawl m with the rack h, -and moveit forward with the jacks against the Alog to set it the proper distaucefor the saw, holdingit rmly in position for sawing.-

When therrack is pushed forward its properilimit, it is stopped inpits movementby a piti, p, that runs through the heed-block and catches the end of the pawl m, and it is also stopped .wheuitis pulled back by another pin, p', that catches against the end.' When the rack is drawn back the pawl m drops and disengages itselt'ltherefrom. v

Having described my improvements and operation, I claim ras neiv, and desire to secure luy-Letters Patent-.- Theslotted plates d d, made fast on the setting-bar a, in combination `w`ith`the frictionerollers-'i i on the end of the pushing-bars gg, the pawl m, and the rack h, constructed, arranged,'and'operating as andfor the purposes herein described. l I

Theabove specification of' my invention signed by me this 29th day ofJ-anuary, `1867.

` JOSEPH HUBBELL Witnesses: v

JOHN Gnmvns, F. B.`A 13Bor 

